Numerical Analysis of Shear Critical RC Beams Strengthened in Shear with FRP Sheets
Publication: Journal of Composites for Construction
Volume 17, Issue 6
Abstract
The objective of this paper is to contribute to the understanding of the shear resisting mechanisms in RC beams shear-strengthened by externally bonded fiber-reinforced polymer (FRP) sheets. For this purpose, a fiber beam model of RC frames subjected to combined normal and shear forces, previously developed by the authors, has been extended to include the response of externally bonded FRP shear reinforcement in a wrapped configuration. No FRP delamination phenomena or tensile strength reductions in the corner zones are taken into account in the model. The numerical results have been compared with eight existing experimental results and the influence of the FRP sheets on the shear strength of the beam has been studied. The effects of the contribution of FRP ratio on the concrete, on the transversal steel strains and stresses, on the longitudinal tensile steel stresses, and on the diagonal compression struts have been analyzed. It is concluded that the presence of FRP reinforcement modifies the inclinations of cracks and struts, the concrete confinement stresses, and other parameters related to the shear response, producing an interaction between the concrete, internal steel, and FRP components of the shear strength.
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Acknowledgments
This work has been developed in the ambit of the research projects “Performance-based-design of partially prestressed concrete structures. Proposal of new design methodology, experimental verification and design criteria” (BIA2012-36848), financed by the Spanish Ministry of Economics and Competitiveness; and “Rehabilitation of roads and motorways” (REHABCAR), funded by the Spanish Ministry of Science and Innovation. Funding provided by the Portuguese Foundation for Science and Technology (FCT) to the first author through the Ph.D. grant SFRH/BD/43232/2008 is also gratefully acknowledged. The authors acknowledge the support of Albert Alzate, Angel Arteaga, Daniel Cisneros and Ana de Diego from the Instituto de Ciencias de la Construcción Eduardo Torroja of Spain, on the provided data related to their experimental program.
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Journal of Composites for Construction
Volume 17 • Issue 6 • December 2013
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 18, 2013
Accepted: Aug 8, 2013
Published online: Aug 10, 2013
Published in print: Dec 1, 2013
Discussion open until: Feb 23, 2014
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